Method for synthesizing fluorescent anti-counterfeiting coating from carbon quantum dot modified waterborne polyurethane with coconut shell as precursor

The invention belongs to the technical field of high polymer materials, and relates to a method for synthesizing a fluorescent anti-counterfeiting coating from carbon quantum dot modified waterborne polyurethane by using coconut shell as a precursor, which comprises the following steps: firstly, using coconut shell as a precursor, carrying out high-temperature cracking to obtain carbon quantum, placing polyisocyanate, polymeric polyol and a dispersing solvent in a container, carrying out N2 replacement, dropwise adding an organic tin catalyst, and carrying out heat preservation for 2-3 hours to obtain the fluorescent anti-counterfeiting coating. Adding carbon quantum dots and a solid base catalyst, adjusting the temperature to 50-80 DEG C, and maintaining the temperature for 0.5-2 hours; and continuously adding a chain extender and carbon quantum dots, dropwise adding a salt addition agent within 5-20 minutes, cooling to room temperature, adding deionized water for emulsification, and dialyzing the emulsion b